/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.accumulo.core.client.lexicoder;

/**
 * A lexicoder for signed integers. The encoding sorts Integer.MIN_VALUE first and Integer.MAX_VALUE
 * last. The encoding sorts -2 before -1. It corresponds to the sort order of Integer.
 *
 * @since 1.6.0
 */
public class IntegerLexicoder extends AbstractLexicoder<Integer> {

  private UIntegerLexicoder uil = new UIntegerLexicoder();

  @Override
  public byte[] encode(Integer i) {
    return uil.encode(i ^ 0x80000000);
  }

  @Override
  public Integer decode(byte[] b) {
    // This concrete implementation is provided for binary compatibility, since the corresponding
    // superclass method has type-erased return type Object. See ACCUMULO-3789 and #1285.
    return super.decode(b);
  }

  @Override
  protected Integer decodeUnchecked(byte[] data, int offset, int len) {
    return uil.decodeUnchecked(data, offset, len) ^ 0x80000000;
  }

}
